Dynamic range reduction using mode filter
First Claim
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1. An apparatus for reducing a dynamic range for an optical receiver, comprising:
- a multimode optical fiber;
a series of write taps serially disposed on the optical fiber;
an optical receiver located downstream of the series of write taps and having means for receiving light from the optical fiber;
means disposed between the optical fiber and the optical receiver for attenuating a magnitude of an optical signal generated by a write tap nearest to the receiver substantially more than a magnitude of an optical signal generated by a write tap furtherest from the receiver, a difference between the attenuations being in excess of 1.0 dB.
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Abstract
A mode filter for reducing a dynamic range of a write optical fiber bus which utilizes taps which initially inject optical signals into an optical fiber which have intensities skewed towards higher order modes rather than lower order modes as compared to equilibrium for the fiber functions to preferentially attenuate outermost modes rather than lowermost modes in the fiber so as to reduce a required dynamic range for an optical receiver.
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Citations
17 Claims
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1. An apparatus for reducing a dynamic range for an optical receiver, comprising:
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a multimode optical fiber; a series of write taps serially disposed on the optical fiber; an optical receiver located downstream of the series of write taps and having means for receiving light from the optical fiber; means disposed between the optical fiber and the optical receiver for attenuating a magnitude of an optical signal generated by a write tap nearest to the receiver substantially more than a magnitude of an optical signal generated by a write tap furtherest from the receiver, a difference between the attenuations being in excess of 1.0 dB. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An optical fiber distribution system for distributing information for a plurality of subscriber terminals, comprising:
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a plurality of subscriber terminals; first means for sending information to each of the terminals; an optical receiver; an optical fiber; a series of taps serially disposed on the optical fiber for injecting a series of optical signals into the optical fiber from the subscriber terminals, each tap injecting its corresponding signal in a manner so as to initially produce within a core of the optical fiber an optical signal which has a power distribution substantially skewed in intensity towards outermost modes as compared to an equilibrium power distribution for the fiber; means disposed between the optical fiber and the optical receiver for attenuating a magnitude of an optical signal generated by a tap nearest to the receiver substantially more than a magnitude of an optical signal generated by a tap furtherest from the receiver, a difference between the attenuations being in excess of 1.0 dB. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification